Liquid cooling system and energy-saving control method thereof

Abstract

The invention relates to the technical field of liquid cooling systems, and discloses a liquid cooling system and an energy-saving control method thereof, and the energy-saving control method comprises the steps: calculating a real-time temperature difference value between the real-time output side temperature and the real-time input side temperature fed back by a first temperature sensor and a second temperature sensor when a real-time assembly operation gear of a fan assembly is less than or equal to a preset minimum effective gear; adjusting the working state of the sub-fan according to a comparison result between the real-time temperature difference value and a preset multi-stage temperature difference threshold value; according to the method disclosed by the invention, whether the liquid cooling system enters the low-load operation mode or not can be judged by monitoring the operation gear of the assembly in real time, and once it is confirmed that the liquid cooling system enters the low-load operation mode, the working state of the sub-fan is adjusted based on the real-time temperature difference value to ensure that the sub-fan can respond to local requirements, so that the adjustment accuracy is improved; besides, by setting a multi-stage temperature difference threshold, a finer adjustment process can be realized, and the problem of adjustment lag or frequent fluctuation caused by single threshold setting is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid cooling systems, and in particular to a liquid cooling system and an energy-saving control method thereof. Background Art

[0002] Liquid cooling systems play a vital role in data center temperature control. Their core function is to ensure that the internal ambient temperature of the data center is maintained within the ideal range through efficient heat exchange mechanisms, thereby ensuring the efficient and stable operation of data center equipment. As the core location for information processing and storage, the workload of the data center has significant periodicity and fluctuation characteristics. To adapt to this dynamic change in workload, the liquid cooling system must be designed to be flexible enough to enable it to adjust its heat dissipation capacity according to the different load requirements of the data center to achieve efficient and energy-saving heat dissipation effects.

[0003] However, traditional liquid cooling systems often find it difficult to effectively adjust their cooling capacity when operating at low loads, resulting in the problem of excess cooling.

[0004] Excess cooling not only wastes energy but may also cause additional power loss. For example, when a data center's computing needs decrease, traditional liquid cooling systems may still operate at full capacity, which not only consumes more electricity but may also cause unnecessary stress on the equipment due to overcooling.

[0005] In addition, the idling problem of fans under low load cannot be ignored; if the fans continue to run without sufficient heat to be discharged, it not only increases the energy consumption of the data center, but may also accelerate the wear of the fans due to long periods of idling, which not only increases maintenance costs but may also shorten the service life of the fans, thereby affecting the long-term reliability of the entire liquid cooling system.

[0006] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0007] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an energy-saving control method for a liquid cooling system, which coordinates the overall situation through the overall control of the fan assembly, and the sub-fans respond to local needs to improve the adjustment accuracy.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A method for energy-saving control of a liquid cooling system, the liquid cooling system includes a liquid cooling unit for providing cooling liquid to a user load, the liquid cooling unit includes a first temperature sensor for obtaining the cooling liquid temperature on the output side of the user load, a second temperature sensor for obtaining the cooling liquid temperature on the input side of the user load, and a fan assembly for cooling the cooling liquid, wherein the fan assembly includes multiple sub-fans; the control method includes: controlling the fan assembly and the multiple sub-fans to start running based on a preset initial gear; obtaining the real-time assembly running gear of the fan assembly, and when the real-time assembly running gear is ≤ the preset lowest valid gear, calculating the real-time temperature difference between the real-time output side temperature fed back by the first temperature sensor and the real-time input side temperature fed back by the second temperature sensor; obtaining a preset multi-stage temperature difference threshold, comparing the calculated real-time temperature difference with the preset multi-stage temperature difference threshold, and adjusting the working state of the sub-fan according to the comparison result.

[0010] In the energy-saving control method of the liquid cooling system, the preset multi-stage temperature difference threshold is obtained, the calculated temperature difference value is compared with the preset multi-stage temperature difference threshold, and the working state of the sub-fan is adjusted according to the comparison result, including: obtaining the preset multi-stage temperature difference threshold, the preset multi-stage temperature difference threshold includes a first-level temperature difference threshold and a second-level temperature difference threshold, and the first-level temperature difference threshold is greater than the second-level temperature difference threshold; when the calculated real-time temperature difference value is greater than or equal to the first-level temperature difference threshold, any sub-fan is turned off; when the next detection time point is reached, if the calculated real-time temperature difference value is greater than or equal to the second-level temperature difference threshold, the other sub-fan is turned off based on the turning off of any sub-fan; otherwise, any sub-fan is maintained in the off state.

[0011] In the energy-saving control method of the liquid cooling system, when the calculated real-time temperature difference value is ≥ the first-level temperature difference threshold, any sub-blower is turned off, and then it also includes: adjusting the detection period of the first temperature sensor and the second temperature sensor to a preset first set period.

[0012] In the energy-saving control method of the liquid cooling system, if the calculated real-time temperature difference value is ≥ the secondary temperature difference threshold, then the other sub-fan is turned off based on the shutdown of any sub-fan, and then it also includes: when the next detection time point is reached, if the calculated real-time temperature difference value is < the preset cooling capacity deficiency response value, then the turned-off sub-fan is restarted or the assembly operating gear of the fan assembly is increased.

[0013] In the energy-saving control method of the liquid cooling system, if the calculated real-time temperature difference value is less than the preset cooling capacity deficiency response value, the shut-down sub-blower or the assembly operating gear of the booster blower assembly is restarted, and then it also includes: adjusting the detection cycle value of the first temperature sensor and the second temperature sensor to a preset second set period.

[0014] In the energy-saving control method of the liquid cooling system, when the next detection time point is reached, if the calculated real-time temperature difference value is less than the preset cooling capacity shortage response value, the closed sub-fan is restarted or the assembly operating gear of the fan assembly is increased. It also includes: when the next detection time point is reached, if the calculated real-time temperature difference value is greater than or equal to the preset cooling capacity surplus value, the highest operating gear of the current sub-fan is obtained; and the real-time operating gears of all sub-fans are adjusted to the obtained highest operating gear.

[0015] In the energy-saving control method of the liquid cooling system, the real-time operating gears of all sub-fans are adjusted to the highest operating gear obtained, and then it also includes: when arriving at the next detection time point, if the calculated real-time temperature difference value is less than the preset cooling capacity deficiency response value, then restart the closed sub-fan or increase the assembly operating gear of the fan assembly.

[0016] The present invention also provides a liquid cooling system accordingly, which adopts any of the energy-saving control methods described above to achieve operation control; the liquid cooling system also includes a control device electrically connected to the liquid cooling unit; the liquid cooling unit also includes a main circulation pipeline and a radiator, a first pressure sensor and a second pressure sensor arranged on the main circulation pipeline; the first pressure sensor is used to obtain the real-time pressure on the output side of the user load, and the second pressure sensor is used to obtain the real-time pressure on the input side of the user load; the fan assembly is used to cool the coolant in the radiator, and the fan assembly includes multiple sub-fans; the radiator is connected to the user load through the main circulation pipeline.

[0017] In the liquid cooling system, the liquid cooling system further includes a liquid replenishing unit, the output end of the liquid replenishing unit is connected to the main circulation pipeline, and is used to replenish coolant to the main circulation pipeline.

[0018] In the liquid cooling system, the liquid cooling unit also includes an expansion tank, an automatic exhaust valve, a shock absorber pipe, and a proportional valve, a third pressure sensor and a fourth pressure sensor electrically connected to the control device respectively; the expansion tank is used to accommodate changes in the volume of the coolant, the automatic exhaust valve is used to discharge the air in the liquid cooling unit, the third pressure sensor is used to monitor the pressure near the expansion tank; the fourth pressure sensor is used to monitor the pressure at the output end of the liquid replenishment unit.

[0019] Beneficial effects:

[0020] The present invention provides an energy-saving control method for a liquid cooling system. By real-time monitoring of the operating gear of the assembly, it can be determined whether the liquid cooling system has entered a low-load operation mode. Once it is confirmed to have entered this mode, the working state of the sub-fan is adjusted based on the real-time temperature difference value to ensure that the sub-fan can respond to local needs, thereby improving the accuracy of the adjustment; in addition, by setting multi-stage temperature difference thresholds, a more precise adjustment process can be achieved, effectively avoiding the adjustment lag or frequent fluctuation problems caused by the setting of a single threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A logic flow chart of the energy-saving control method provided by the present invention;

[0022] Figure 2 This is a structural schematic diagram of the liquid cooling system provided by the present invention.

[0023] Description of the main component symbols: 101-fan assembly, 102-main circulation pipeline, 103-radiator, 104-first pressure sensor, 105-second pressure sensor, 106-first temperature sensor, 107-second temperature sensor, 108-automatic exhaust valve, 109-expansion tank, 110-shock absorber pipe, 111-proportional valve, 112-third pressure sensor, 113-fourth pressure sensor, 21-liquid storage tank, 22-liquid replenishing pump, 23-check valve, 3-user load. DETAILED DESCRIPTION

[0024] The present invention provides a liquid cooling system and an energy-saving control method thereof. To make the purpose, technical solution and effects of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0025] In the description of the present invention, it should be understood that the terms "installation" and "connection" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1 and Figure 2 The present invention provides an energy-saving control method for a liquid cooling system. The liquid cooling system includes a liquid cooling unit for providing cooling liquid to a user load. The liquid cooling unit includes a first temperature sensor for obtaining the cooling liquid temperature at the output side of the user load, a second temperature sensor for obtaining the cooling liquid temperature at the input side of the user load, and a fan assembly for cooling the cooling liquid. The fan assembly includes a plurality of sub-fans. The control method includes:

[0027] 101. Control the fan assembly and multiple sub-fans to start running based on a preset initial gear;

[0028] In this embodiment, the initial gear is greater than the preset lowest effective gear, ensuring that the liquid cooling system has basic heat dissipation capacity when it starts.

[0029] In this embodiment, the fan assembly is an overall system including multiple sub-fans, and the sub-fans are independent execution units under the fan assembly; the fan assembly serves as the global control subject, and the control device sets the assembly operating gear, and triggers the low-load energy-saving mode through the lowest effective gear; the sub-fans serve as distributed execution subjects, which can independently start and stop or adjust the gear to respond to local temperature difference requirements; the two are coordinated through the master control-distributed spatial coupling control method, that is, the assembly determines the global power benchmark, and the sub-fans are responsible for local heat dissipation adjustment.

[0030] 102. Obtain the real-time assembly operating gear of the fan assembly. When the real-time assembly operating gear is less than or equal to the preset lowest valid gear, calculate the real-time temperature difference between the real-time output side temperature fed back by the first temperature sensor and the real-time input side temperature fed back by the second temperature sensor.

[0031] In this embodiment, the operating gear of the fan assembly is monitored in real time. When it is detected that the real-time operating gear of the assembly is ≤ the preset lowest effective gear, it indicates that the liquid cooling system is in the lowest effective heat dissipation state and may face the situation of further load reduction. At this time, the temperature difference calculation process is triggered, and the calculated real-time temperature difference value is used to reflect the current actual heat dissipation demand of the liquid cooling system.

[0032] 103. Obtain a preset multi-stage temperature difference threshold, compare the calculated real-time temperature difference value with the preset multi-stage temperature difference threshold, and adjust the working state of the sub-fan according to the comparison result;

[0033] In this embodiment, the assembly gear represents the overall heat dissipation capacity of the liquid cooling system, and the overall load changes of the data center are responded to by adjusting the assembly operating gear; the sub-fan gear is used to solve the problem of uneven temperature in local areas, such as turning off the sub-fans in non-hot spot areas under low load to save energy.

[0034] The present application discloses an energy-saving control method for a liquid cooling system. By real-time monitoring of the operating gear of the assembly, it can be determined whether the liquid cooling system has entered a low-load operating mode, thereby avoiding energy waste caused by full-power idling of a traditional liquid cooling system; once it is confirmed that the liquid cooling system has entered a low-load mode, the working state of the sub-fan is adjusted based on the real-time temperature difference value, which can ensure that the sub-fan responds accurately to local needs and improves the accuracy of the adjustment. It not only replaces the traditional extensive control method of fixed gear or start-stop temperature, but also realizes dynamic matching of cooling demand and heat dissipation capacity, effectively reducing the problem of excess cooling under low load; in addition, by setting multi-stage temperature difference thresholds, a more precise adjustment process can be achieved, effectively avoiding the adjustment lag or frequent fluctuation problems caused by single threshold setting.

[0035] In an embodiment of the present invention, obtaining a preset multi-stage temperature difference threshold, comparing the calculated temperature difference value with the preset multi-stage temperature difference threshold, and adjusting the working state of the sub-blower according to the comparison result includes:

[0036] 201. Obtain a preset multi-stage temperature difference threshold, where the preset multi-stage temperature difference threshold includes a primary temperature difference threshold and a secondary temperature difference threshold, and the primary temperature difference threshold is greater than the secondary temperature difference threshold;

[0037] In this embodiment, the first-level temperature difference threshold can be 10°C, and the second-level temperature difference threshold can be 8°C; the first-level temperature difference threshold corresponds to a state of significant excess cooling capacity, and the second-level temperature difference threshold corresponds to a state of continuous excess cooling capacity but with a reduced degree. The layered threshold is used to avoid adjustment lag or frequent fluctuations caused by a single threshold.

[0038] 202. When the calculated real-time temperature difference value is greater than or equal to the first-level temperature difference threshold, any sub-fan is turned off;

[0039] 203. When the next detection time point is reached, if the calculated real-time temperature difference value is greater than or equal to the secondary temperature difference threshold, then one of the sub-fans is turned off based on the other sub-fan being turned off; otherwise, one of the sub-fans is kept in the off state;

[0040] In this embodiment, when the calculated real-time temperature difference value is ≥ the first-level temperature difference threshold, any sub-fan is turned off, and the number of running sub-fans is reduced to reduce power consumption; after turning off the sub-fan, the next detection cycle is entered. If the real-time temperature difference value is ≥ the second-level temperature difference threshold, another sub-fan is turned off; otherwise, the current sub-fan status is maintained, that is, other sub-fans are not turned off further; through the progressive judgment of the first-level and second-level temperature difference thresholds, refined control is achieved, in which the deeper the degree of excess cooling capacity, the more fans are turned off, thereby avoiding the risk of insufficient cooling capacity caused by turning off too many fans at one time, and turning off the sub-fans in stages instead of frequent starting and stopping can reduce the number of starts and stops of the sub-fans and extend the service life of the equipment.

[0041] In an embodiment of the present invention, when the calculated real-time temperature difference value is greater than or equal to the first-level temperature difference threshold, any sub-blower is turned off, and the method further includes:

[0042] 301. Adjust the detection period of the first temperature sensor and the second temperature sensor to a preset first set period;

[0043] In this embodiment, when the first-level temperature difference threshold is triggered and any sub-fan is turned off, the detection cycle of the two temperature sensors is shortened to the first set cycle, which is 1-3 minutes; since turning off the sub-fan may cause a sudden drop in heat dissipation capacity when there is excess cooling capacity, shortening the detection cycle can speed up the response speed of the liquid cooling system to changes in cooling capacity, and avoid insufficient cooling capacity caused by turning off too many sub-fans; by maintaining a high detection frequency while energy-saving adjustment, it is ensured that the liquid cooling system can still capture temperature fluctuations in time under low load, and balance energy saving and stability; when the excess cooling capacity state is lifted, the system can quickly restart the sub-fan to avoid local overheating caused by detection lag.

[0044] In an embodiment of the present invention, if the calculated real-time temperature difference value is greater than or equal to the secondary temperature difference threshold, then turning off another sub-blower on the basis of turning off any sub-blower, further comprising:

[0045] 401. When the next detection time point is reached, if the calculated real-time temperature difference is less than the preset cooling capacity insufficient response value, restart the shut-down sub-fan or increase the assembly operation gear of the fan assembly;

[0046] In this embodiment, the preset insufficient cooling capacity response value can be 3°C; when the real-time temperature difference is detected to be less than the preset insufficient cooling capacity response value, it indicates that the current heat dissipation capacity of the liquid cooling system is insufficient and heat dissipation needs to be enhanced to ensure that the liquid cooling system quickly restores its heat dissipation capacity when the load recovers to prevent equipment from overheating and damage; when actually performing heat dissipation compensation, the sub-fans that have been turned off can be restarted first to restore some heat dissipation capacity; if all sub-fans are running, that is, there is no sub-fan in the off state, then the assembly operating gear of the fan assembly is increased to enhance heat dissipation by increasing power; by combining the two methods of restarting the sub-fan and increasing the assembly operating gear, the insufficient cooling requirements in different scenarios are covered, and the robustness of the liquid cooling system is improved.

[0047] In an embodiment of the present invention, if the calculated real-time temperature difference is less than the preset cooling capacity shortage response value, the shut-down sub-blower is restarted or the assembly operation gear of the booster assembly is increased, and then the following steps are further included:

[0048] 501. Adjust the detection period of the first temperature sensor and the second temperature sensor to a preset second set period;

[0049] In this embodiment, after the insufficient cooling capacity compensation operation is performed, that is, after the sub-blower is restarted or the operating gear of the blower assembly is increased, the detection period of the two temperature sensors is extended to the second set period, which can be 5-10 minutes; since the liquid cooling system has entered a high heat dissipation state when the cooling capacity is insufficient, extending the detection period can reduce the energy consumption loss of high-frequency detection and achieve a balance between control accuracy and energy efficiency; at the same time, it can avoid frequent adjustments caused by load fluctuations and invalid adjustments caused by short-term temperature fluctuations, thereby improving the stability of the liquid cooling system during operation.

[0050] In an embodiment of the present invention, when the next detection time point is reached, if the calculated real-time temperature difference value is less than the preset cooling capacity shortage response value, the shut-down sub-fan is restarted or the assembly operation gear of the fan assembly is increased, and then the following steps are further included:

[0051] 601. When the next detection time point is reached, if the calculated real-time temperature difference value is greater than or equal to the preset excess cooling capacity value, the highest operating gear of the current sub-fan is obtained;

[0052] 602. Adjust the real-time operating gear of all sub-fans to the obtained highest operating gear;

[0053] In this embodiment, the preset excess cooling capacity value can be 15°C; when the real-time temperature difference value is ≥ the preset excess cooling capacity value, it indicates that there is a serious excess cooling capacity in the liquid cooling system, and it may be accompanied by an unbalanced operating state of the sub-fans, such as some sub-fans are highly loaded while some sub-fans are idle; at this time, the highest gear value of all currently running sub-fans is obtained, such as a sub-fan is running in gear 3 and other sub-fans are running in gear 1, then the highest gear is gear 3; by uniformly adjusting the gears of all sub-fans to the highest gear, it is ensured that each sub-fan runs at the same power, and the power of all running sub-fans can be concentrated to cope with extreme excess cooling scenarios, thereby avoiding a decrease in overall heat dissipation efficiency due to idleness of local fans; in addition, forced synchronization of gears can avoid the problem of uneven wear caused by long-term high-load operation of some sub-fans and long-term low-load operation of some sub-fans, thereby extending the overall life of the fan assembly.

[0054] In an embodiment of the present invention, the step of adjusting the real-time operating gears of all sub-blowers to the acquired highest operating gear further includes:

[0055] 701. When the next detection time point is reached, if the calculated real-time temperature difference is less than the preset cooling capacity insufficient response value, restart the shut-down sub-fan or increase the assembly operation gear of the fan assembly;

[0056] In this embodiment, a circulation mechanism of extreme excess cooling, gear synchronization, insufficient cooling, and compensatory adjustment is used to ensure that the liquid cooling system always maintains a dynamic balance between heat dissipation and energy saving when facing complex load fluctuations; under any load fluctuation conditions, the liquid cooling system can automatically respond based on preset thresholds and multi-level adjustment strategies, significantly reducing the need for manual intervention and thereby improving the intelligence level of the system.

[0057] The method disclosed in this application systematically addresses the energy efficiency and reliability issues faced by traditional liquid cooling systems during low-load operation by constructing a complete control closed loop. The control closed loop consists of four key steps: low-load identification, phased energy saving, cooling capacity shortage compensation, and extreme scenario optimization. First, the low-load identification step accurately determines the current load level by monitoring the system's operating status in real time, ensuring that subsequent energy-saving measures can be adjusted according to the actual load. Second, the phased energy saving step takes corresponding energy-saving measures based on the results of low-load identification, enabling the liquid cooling system to minimize energy consumption while ensuring the cooling needs of the equipment. Next, the cooling capacity shortage compensation step ensures that the system can replenish the required cooling capacity in a timely manner during low-load operation, avoiding equipment overheating caused by insufficient cooling capacity. Finally, the extreme scenario optimization step optimizes and adjusts to possible extreme operating conditions, such as sudden high loads or extreme temperature changes, enabling the liquid cooling system to quickly adapt to these extreme scenarios and ensure efficient and stable operation under all circumstances. Through this constructed control closed loop, not only the energy efficiency and reliability issues of traditional liquid cooling systems under low loads are resolved, but also the adaptability of the liquid cooling system to different load scenarios is improved.

[0058] See also Figure 2 The present invention also provides a liquid cooling system, which uses any of the above energy-saving control methods to achieve operational control. The liquid cooling system includes a liquid cooling unit for providing coolant to the user load 3 and a control device electrically connected to the liquid cooling unit. The liquid cooling unit includes a fan 101, a main circulation pipeline 102, a radiator 103 arranged on the main circulation pipeline 102, a first pressure sensor 104, a second pressure sensor 105, a first temperature sensor 106, and a second temperature sensor 107. The first pressure sensor 104 is used to obtain the real-time pressure on the output side of the user load 3, the second pressure sensor 105 is used to obtain the real-time pressure on the input side of the user load 3, the first temperature sensor 106 is used to obtain the real-time liquid temperature on the output side of the user load 3, and the second temperature sensor 107 is used to obtain the real-time liquid temperature on the input side of the user load 3. The fan assembly 101 is used to cool the coolant in the radiator 103, and the fan assembly 101 includes multiple sub-fans. In this embodiment, the fan assembly 101 includes three sub-fans.

[0059] Further, see Figure 2 The liquid cooling system further includes a liquid replenishing unit, the output end of which is connected to the main circulation pipeline 102 for replenishing coolant to the main circulation pipeline 102.

[0060] In this example, see Figure 2 The rehydration unit includes a liquid storage tank 21, a one-way valve 23 and a rehydration pump 22 electrically connected to the control device. The liquid storage tank 21 is connected to the rehydration pump 22 through a pipeline to provide a source of coolant replenishment for the liquid cooling unit. The liquid level of the liquid storage tank 21 is monitored by a liquid level sensor in real time; one end of the rehydration pump 22 is connected to the liquid storage tank 21, and the other end is connected to the main circulation pipeline 102 through the one-way valve 23.

[0061] Further, see Figure 2 The liquid cooling unit also includes an expansion tank 109, an automatic exhaust valve 108, a shock absorber pipe 110, and a proportional valve 111, a third pressure sensor 112, and a fourth pressure sensor 113 electrically connected to the control device respectively; the expansion tank 109 is used to accommodate the volume change of the coolant, the heat exchanger performs heat exchange, and the automatic exhaust valve 108 discharges the air in the liquid cooling unit. The third pressure sensor 112 is used to monitor the pressure near the expansion tank 109 and provide key data for the pressure control of the liquid cooling system to determine whether fluid replenishment is needed and to adjust the gear position of the fluid replenishment pump 22; the fourth pressure sensor 113 is used to monitor the pressure after the outlet of the fluid replenishment pump 22 to assist in determining the pressure state of the liquid cooling system and the working condition of the fluid replenishment pump 22.

[0062] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the scope of protection of the present invention.

Claims

1. An energy-saving control method for a liquid cooling system, characterized in that: The liquid cooling system includes a liquid cooling unit for providing cooling liquid to the user load, the liquid cooling unit includes a first temperature sensor for obtaining the cooling liquid temperature at the output side of the user load, a second temperature sensor for obtaining the cooling liquid temperature at the input side of the user load, and a fan assembly for cooling the cooling liquid, the fan assembly including a plurality of sub-fans; The control method includes: Controlling the fan assembly and multiple sub-fans to start running based on a preset initial gear; Obtaining the real-time assembly operating gear of the fan assembly, and when the real-time assembly operating gear is less than or equal to the preset lowest valid gear, calculating the real-time temperature difference between the real-time output side temperature fed back by the first temperature sensor and the real-time input side temperature fed back by the second temperature sensor; Obtain a preset multi-stage temperature difference threshold, compare the calculated real-time temperature difference value with the preset multi-stage temperature difference threshold, and adjust the working state of the sub-fan according to the comparison result.

2. The energy-saving control method for a liquid cooling system according to claim 1, characterized in that: The step of obtaining a preset multi-stage temperature difference threshold, comparing the calculated temperature difference value with the preset multi-stage temperature difference threshold, and adjusting the working state of the sub-blower according to the comparison result includes: Obtaining a preset multi-stage temperature difference threshold, wherein the preset multi-stage temperature difference threshold includes a first-level temperature difference threshold and a second-level temperature difference threshold, wherein the first-level temperature difference threshold is greater than the second-level temperature difference threshold; When the calculated real-time temperature difference value is greater than or equal to the first-level temperature difference threshold, any sub-fan is turned off; When the next detection time point is reached, if the calculated real-time temperature difference value is ≥ the secondary temperature difference threshold, then one sub-fan is turned off based on the other sub-fan being turned off; otherwise, either sub-fan is kept in the off state.

3. The energy-saving control method for a liquid cooling system according to claim 2, characterized in that: When the calculated real-time temperature difference value is greater than or equal to the first-level temperature difference threshold, any sub-blower is turned off, and the method further includes: The detection periods of the first temperature sensor and the second temperature sensor are adjusted to a preset first set period.

4. The energy-saving control method for a liquid cooling system according to claim 2, characterized in that: If the calculated real-time temperature difference value is greater than or equal to the secondary temperature difference threshold, then the other sub-fan is turned off based on the turning off of any sub-fan, and then the following steps are further included: When the next detection time point is reached, if the calculated real-time temperature difference value is less than the preset cooling capacity shortage response value, the shut-down sub-fan is restarted or the assembly operation gear of the fan assembly is increased.

5. The energy-saving control method for a liquid cooling system according to claim 4, characterized in that: If the calculated real-time temperature difference is less than the preset cooling capacity shortage response value, restarting the shut-down sub-fan or raising the assembly operation gear of the fan assembly, further comprising: The detection periods of the first temperature sensor and the second temperature sensor are adjusted to a preset second set period.

6. The energy-saving control method for a liquid cooling system according to claim 4, characterized in that: When the next detection time point is reached, if the calculated real-time temperature difference value is less than the preset cooling capacity insufficient response value, the closed sub-fan is restarted or the assembly operation gear of the fan assembly is increased, and then the following is further included: When the next detection time point is reached, if the calculated real-time temperature difference value is greater than or equal to the preset excess cooling capacity value, the highest operating gear of the current sub-fan is obtained; Adjust the real-time operating gear of all sub-fans to the highest operating gear obtained.

7. The energy-saving control method for a liquid cooling system according to claim 6, characterized in that: The step of adjusting the real-time operating gears of all sub-blowers to the acquired highest operating gear may further include: When the next detection time point is reached, if the calculated real-time temperature difference value is less than the preset cooling capacity shortage response value, the shut-down sub-fan is restarted or the assembly operation gear of the fan assembly is increased.

8. A liquid cooling system, characterized in that: The liquid cooling system adopts the energy-saving control method described in any one of claims 1 to 7 to achieve operation control; the liquid cooling system also includes a control device electrically connected to the liquid cooling unit; the liquid cooling unit also includes a main circulation pipeline and a radiator, a first pressure sensor and a second pressure sensor arranged on the main circulation pipeline; the first pressure sensor is used to obtain the real-time pressure on the output side of the user load, and the second pressure sensor is used to obtain the real-time pressure on the input side of the user load; the fan assembly is used to cool the coolant in the radiator, and the fan assembly includes multiple sub-fans; the radiator is connected to the user load through the main circulation pipeline.

9. The liquid cooling system according to claim 8, characterized in that: The liquid cooling system further comprises a liquid replenishing unit, the output end of which is connected to the main circulation pipeline for replenishing cooling liquid to the main circulation pipeline.

10. The liquid cooling system according to claim 9, characterized in that: The liquid cooling unit also includes an expansion tank, an automatic exhaust valve, a shock absorber pipe, and a proportional valve, a third pressure sensor, and a fourth pressure sensor electrically connected to the control device respectively; the expansion tank is used to accommodate changes in the volume of the coolant, the automatic exhaust valve is used to discharge the air in the liquid cooling unit, the third pressure sensor is used to monitor the pressure near the expansion tank; the fourth pressure sensor is used to monitor the pressure at the output end of the liquid replenishment unit.

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